Finding the Fourth Proportional to 4,752.56, 7,128.72 and 1,289.72

Step by Step Solution

1. Step 1: Write the proportion equation
   4,752.56 : 7,128.72 = 1,289.72 : x
2. Step 2: Convert to fraction form
   4,752.56/7,128.72 = 1,289.72/x
3. Step 3: Cross multiply
   4,752.56x = 7,128.72 × 1,289.72
4. Step 4: Simplify right side
   4,752.56x = 9,194,052.76
5. Step 5: Solve for x
   x = 9,194,052.76/4,752.56
6. Step 6: Final answer
   x = 1,934.55